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Fig. 8

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MDCs at the Ml stage (i.e., the NH3 (1,1) emission is roughly concentrated around the column density peaks). The background is pseudo three-color images of each field, with Spitɀer 8, 4.5, and 3.6 µm emission colored in red, green, and blue, respectively. The contours of H2 column density and NH3 (1,1) integrated emission are over-plotted with green and orange, respectively. Cyan and magenta crosses mark the positions of any H2O masers or radio continuum sources, respectively. The starless, IR-quiet, and IR-bright MDCs are shown as pink dashed, red dashed, and red solid ellipses, respectively. More figures are showed in Appendix C.

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